From: Nuralanur@...
Date: 2005-09-27T17:53:39+09:00
Subject: Re: In search of a kind of converse to sub/gsub

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Axel asked for a method find_what_to_replace
> ... such that   for
>
> replace_what_substring,replace_it_by 
>  =string1.find_what_to_replace(string2)
>
> the  statement
>
> string2 ==  string1.gsub(replace_what_substring,replace_it_by)
>
> holds true  .
>
> Has anybody done that already?

Does Diff::LCS do what  you want? It returns the differences between strings.
(You can get it from  http://rubyforge.org/frs/?group_id=84 or via rubygems)

Cheers,
Dave  

Thank you , Dave - that's 100 out of 100 points!
 
Best regards,
 
Axel

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